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Certain gemstones are formed by magma, a material found deep

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Re: Certain gemstones are formed by magma, a material found deep [#permalink]

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New post 10 Apr 2017, 21:41
I understand A and C are the real contenders here but need to find expert opinion which will help to surely eliminate C so that we can use that or keep that in mind for such questions.

As per the stem, company wants to create a new source of profits. This method will utilize applying chemicals, ones they manufacture, to the rock samples rather than mining.

So they found an alternative which is considered cheaper than the mining method; however, if the materials from which emeralds are made are not found on the surface of the Earth then they would have to resort to mining. This new method, which is considered cheaper, is no longer viable. Hence, this can affect the success of company's plan.

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Re: Certain gemstones are formed by magma, a material found deep [#permalink]

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New post 27 Aug 2017, 22:12
Certain gemstones are formed by magma, a material found deep inside the Earth, that has pushed toward the surface and solidified; others are created when superheated water and gases cool. When chemical action, heat, or pressure changes the existing structure of rocks, they may recrystallize to form gemstones such as emeralds. A large chemical company plans to create a new source of profits by applying certain of the chemicals it manufactures to specifically chosen rock samples, which would be a much less expensive way to produce emeralds than mining them.

which one of the following, if true, poses the most serious problem for the success of the company’s
plan?

A. Man-made emeralds will not be considered as valuable as naturally produced emeralds.
B. Natural emeralds are produced by heat and pressure much more frequently than by chemical action.
C. The types of material from which emeralds are formed are not found on the Earth’s surface.
D. Laboratory conditions are difficult to replicate in a large-scale factory.
E. The gases that will mix with superheated water are so toxic that workers could suffer from a number of serious medical conditions if the handling of such gases is not strictly controlled.

pre-thinking :-
profit = revenue - expense

A. Man-made emeralds will not be considered as valuable as naturally produced emeralds. Even if they are not considered as valuable, it doesnt mean that they can not be sold at profit.


C. The types of material from which emeralds are formed are not found on the Earth’s surface. : but if the raw material is not available, the manufacturer has to dig deeper, hence the increase in expense. Although not a full-proof options, but better than A.


B. Natural emeralds are produced by heat and pressure much more frequently than by chemical action. : - out of scope.

Expert : pl comment

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New post 28 Aug 2017, 03:16
mysterio wrote:
still don't feel fully convinced why C cannot be the correct answer.. Could someone explain the reasoning involved here in detail

A type of material not found on the surface of the earth doesnt mean it is found deep inside the earth, there can be a possibilty that the material is just below the surface of the earth and the mining cost of that material would be minimal so as to mine it and make emrald from it, thereby increasing the company's profit.

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Re: Certain gemstones are formed by magma, a material found deep [#permalink]

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New post 28 Aug 2017, 08:08
MY Choice C)

The chemical needed to produce emerald is not available on surface of earth.

Which again goes back to mining.

The reasoning given in conclusion is to avoid mining and save the cost.

The only option that attacks conclusion is C)


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Certain gemstones are formed by magma, a material found deep [#permalink]

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New post 28 Aug 2017, 10:48
Certain gemstones are formed by magma, a material found deep inside the Earth, that has pushed toward the surface and solidified; others are created when superheated water and gases cool. When chemical action, heat, or pressure changes the existing structure of rocks, they may recrystallize to form gemstones such as emeralds. A large chemical company plans to create a new source of profits by applying certain of the chemicals it manufactures to specifically chosen rock samples, which would be a much less expensive way to produce emeralds than mining them.

Type - weaken
Boil it down - Profit = Revenue from sale - Cost to produce or mine
- The new process will reduce the cost to produce , but it assumes that revenue from the sale will not be adversely affected.

A. Man-made emeralds will not be considered as valuable as naturally produced emeralds.- Correct - If the emeralds are not considered as valuable , then selling price will be much lesser and thus profits might not be as expected .
B. Natural emeralds are produced by heat and pressure much more frequently than by chemical action. - Incorrect - frequency of process in natural formation does not matter .
C. The types of material from which emeralds are formed are not found on the Earth’s surface. - warp or ISWAT - we still might have an economical way to mine the material or it might be just below the surface
D. Laboratory conditions are difficult to replicate in a large-scale factory. - Irrelevant -it might be difficult but it is still possible
E. The gases that will mix with superheated water are so toxic that workers could suffer from a number of serious medical conditions if the handling of such gases is not strictly controlled. - Out of scope

Answer A
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Certain gemstones are formed by magma, a material found deep   [#permalink] 28 Aug 2017, 10:48

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